1 files changed, 40 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..b8892fa
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,40 @@
+{
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils, ... }:
+  utils.lib.eachDefaultSystem (system: 
+  let
+    pkgs = nixpkgs.legacyPackages."${system}";
+    nativeBuildInputs = with pkgs; [
+      flex
+      bison
+    ];
+
+    buildScript = pkgs.writeScriptBin "build-script"
+    ''
+      set -e
+      prog_name="$1"
+      outdir="outputs/$prog_name"
+      mkdir -p "$outdir"
+
+      ${pkgs.flex}/bin/flex -o "$outdir"/lex.yy.cc "$prog_name"/main.l
+      ${pkgs.gcc}/bin/gcc "$outdir"/lex.yy.cc -o "$outdir"/exec
+
+      ./"$outdir"/exec < "$prog_name"/input
+      rm -r "outputs"/*
+      '';
+
+  in rec {
+    devShell = pkgs.mkShell {
+      nativeBuildInputs = nativeBuildInputs ++ (with pkgs; [
+        gcc
+      ]);
+    };
+    defaultApp = {
+      type = "app";
+      program = "${buildScript}/bin/build-script";
+    };
+  });
+}